I wonder if he thought about bringing a version of the Family Disk for the NES ... Here there seem to be other patents of ideas and designs for the Famicom / NES of accessories without launching:
-Memory Cartridge:
A 1987 cartridge to save games and then return them at the same level with the same lives, score, etc.
https://patents.google.com/patent...-Bycicle Type Training System
https://patents.google.com/patent...
This is an NES bicycle from Japan, similar to Radac Taylor-Made, 1987.
-Knitting Machine System
https://patents.google.com/patent... = Knitting + Machine & assignee = Nintendo & oq = Nintendo + Knitting + Machine)
This is known an advertisement, was designed in 1986 by Masakazu Nagano and Yasuko Nagano, there are no patent images.
-Patient of the ROB
https://patents.google.com/patent...On the possibility of an expansion for diskettes in the bottom of the NES, there were rumors about a "Phantom System" in 1986 (Computer Entertainer, August), perhaps the aforementioned expansion.